摘要
地裂缝地质灾害一直以来对工程的建设都产生严重的影响。以大西高速铁路为例,选择具有代表性的地裂缝,在现场进行了大量的调查工作,获得了必要的计算参数,进而建立高速铁路桥梁段穿越地裂缝的数值模型。利用Flac3D数值软件进行计算,模型使高速铁路45°穿越地裂缝,通过强制位移控制地裂缝及上盘的活动大小。通过计算地裂缝及上盘下降5、10、20、30、40 cm的5种工况,分析桥梁的变形及桩基的受力特征,得出地裂缝活动对桥梁影响的规律。
Engineering constructions is always plagued by the ground fissure disaster. Taking the high-speed railway from Xi＇ an to Datong as an example, the paper, with the typical ground fissure as the sample, carries out a lot of investigative work in the field to get calculation parameters to establish numerical model. This paper Flac3D numerical software is used for calculation. High-speed railway is simulated to pass though the ground fissure with 45 ~ intersection angle and fissure and plate bonding activity are controled by forcible displacement. By decreasing ground fissure to 5cm, 10 cm,20 cm, 30 cm,40 cm, bridges deformation and force characteristics of the pile foundation are analyzed to get the nile of the impact of ground fissure on high-speed railway.
出处
《铁道建筑技术》
2013年第1期110-113,共4页
Railway Construction Technology
基金
铁道部科技研究开发计划课题(2010G003-E)
国家自然科学基金项目(41072222)
国土资源大调查项目(1212011220187)
关键词
高速铁路
桥梁
地裂缝
数值模拟
high-speed railway
bridge
ground fissure
numerical simulation
